Hair bleach

ABSTRACT

An oxidative hair bleach comprising a first pack with an alkalizing agent contained therein and a second pack with an oxidizing agent contained therein, wherein the oxidative hair bleach comprises the following ingredients (A), (B), (C), (D) and (E) in the following proportions in a whole composition after mixing the first pack and the second pack together, and has a pH of from 8 to 12:
         (A) a water-miscible organic solvent having an octanol-water distribution coefficient (log P) at 25° C. of 0.3 or greater and a molecular weight of 200 or lower: 8 to 40 wt. %;   (B) the alkalizing agent: 0.1 to 10 wt. %;   (C) the oxidizing agent: 0.1 to 12 wt. % as calculated in terms of hydrogen peroxide;   (D) water: 25 to 70 wt. % and   (E) an anionic surfactant or ampholytic surfactant in a proportion of 60 wt. % or less in said whole composition after mixing said first pack and said second pack together.
 
This hair bleach has excellent bleaching power and can color hair into a light tone and a good shade, and has a reduced irritating odor and is low in irritation to the scalp.

TECHNICAL FIELD

This invention relates to a hair bleach excellent in bleaching power forhair or the like or a hair dye excellent in dyeing power for hair or thelike, which has a predetermined octanol-water partition coefficient orgreater and contains a low-molecular, water-miscible organic solvent.

BACKGROUND ART

As oxidative hair bleaches or hair dyes, those of the two-pack type,each comprising a first pack with an alkalizing agent contained thereinand a second pack with an oxidizing agent contained therein, are widelyused. The alkalizing agent in the first pack is incorporated to obtain alight tone by heightening beaching or dyeing effect and causingoxidative decomposition of melamine granules to proceed in hair. Tobleach or dye hair into a tone lighter than his or her own hair color,sufficient bleaching power is needed. When an oxidative hair bleach orhair dye is used for such purposes, alkali is required in a particularlysufficient amount because hair bleaching power generally depends uponthe amount of alkali.

Conventionally, ammonia has been used as an alkali agent in general.However, ammonia has a strong irritating odor and hence, involves adrawback that it gives considerable unpleasant feeling upon bleaching ordyeing.

Attempts have, therefore, been made to use organic amines of a lowerirritating odor in place of ammonia (JP-A-59106413, JP-A-01213220,JP-A-05246827, etc.). These attempts, however, cannot bleach hair into asufficiently light shade and moreover, use of such organic amines inlarge amounts, due to their high remaining tendency on the scalp, leadsto a problem that irritation tends to be given.

DISCLOSURE OF THE INVENTION

An object of the present invention is, therefore, to provide a hairbleach or hair dye, which has excellent bleaching power, can dye hair ina light tone and good shade, and has a reduced irritating odor and islow in irritation to the scalp.

The present inventors have found that inclusion of a specificwater-miscible organic solvent in a particular proportion in anoxidative hair bleach or an oxidative hair dye makes it possible toprovide the treatment with increased hydrophobicity and hence to promotetransferability of the bleach (an alkalizing agent and an oxidizingagent) into hair and as a result, makes it possible to achieve theabove-described object.

The present invention provides an oxidative hair bleach or hair dyecomprising a first pack with an alkalizing agent contained therein and asecond pack with an oxidizing agent contained therein, wherein theoxidative hair bleach or hair dye comprises the following ingredients(A), (B), (C) and (D) in the following proportions in a wholecomposition after mixing the first pack and the second pack together,and has a pH of from 8 to 12:

-   -   (A) a water-miscible organic solvent having an octanol-water        distribution coefficient (log P) at 25° C. of 0.3 or greater and        a molecular weight of 200 or lower: 8 to 40 wt. %    -   (B) the alkalizing agent: 0.1 to 10 wt. %    -   (C) the oxidizing agent: 0.1 to 12 wt. % as calculated in terms        of hydrogen peroxide    -   (D) water: 25 to 70 wt. %.

The present invention also provides a method for bleaching or dyeinghair, which comprises applying the above-described bleach or dye to thehair.

BEST MODES FOR CARRYING OUT THE INVENTION

Concerning the water-miscible organic solvent as the ingredient (A), theterm “log P” is an indicator of partition of a substance between anoctanol phase and a water phase, and is defined by the below-describedformula. Examples of its calculated values and measured values aredisclosed in A. Leo, C. Hash, and D. Elkins: “Chemical Reviews”, 71(6),(1971). In the present invention, however, it means a value as measuredat 25° C. in accordance with the method described in The Law Concerningthe Examination and Regulation of Manufacture of Chemical Substances,Revised 4^(th) Edition, “Measuring Method of Partition Coefficients ofChemical Substances (in 1-Octanol/Water) <Part 1>” (Published by TheChemical Daily Co., Ltd.)logP=log([substance]_(octanol)/[substance]_(water))wherein [substance]_(octanol) means the molar concentration of thesubstance in the octanol phase and [substance]_(water) means the molarconcentration of the substance in the water phase.

log P (25° C.) of the water-miscible organic solvent for use in thepresent invention is required to be 0.3 or greater, preferably from 0.8to 1.3 from the viewpoint of good transferability of the bleach to hair.From the viewpoint of bleaching power, on the other hand, the molecularweight of the organic solvent is required to be 200 or lower, preferably185 or lower, more preferably 160 or lower. Examples of suchwater-miscible organic solvents can include benzyl alcohol (log P at 25°C.=1.1; this applies equally hereinafter), 2-benzyloxy ethanol (1.2),ethylene glycol mono-n-butyl ether (0.8), diethylene glycol mono-n-butylether (0.9), and n-butanol (0.8). Among these, benzyl alcohol and2-benzyoxy ethanol are preferred. These organic solvents can be usedeither singly or in combination, and from the standpoint of providingsufficient bleaching or dyeing effect, the content of the water-miscibleorganic solvent can be from 8 to 40 wt. % based on the whole compositionformed in combination of the first pack and the second pack, with 10 to40 wt. %, especially 10 to 25 wt. % being preferred.

Illustrative of the alkalizing agent as the ingredient (B) arealkalizing agents other than ammonia, specifically alkanolamines such asmonoethanolamine and isopropanolamine, and guanidinium salts such asguanidine carbonate. Of these, alkanolamines are preferred, withmonoethanolamine being particularly preferred. These alkalizing agentscan be used either singly or in combination. From the standpoint ofproviding sufficient bleaching or dyeing effect and also reducingirritation to the scalp, the content of the alkalizing agent may be from0.1 to 10 wt. % based on the whole composition formed in combination ofthe first pack and the second pack, with 0.5 to 5 wt. %, especially 1 to3 wt. % being preferred. The hair bleach or hair dye according to thepresent invention can bring about sufficient bleaching or dyeing effectwithout using ammonia as an alkalizing agent, and is completely free ofan ammonia-derived irritating odor and gives no unpleasant feelingduring use. Accordingly, the hair bleach or hair dye according to thepresent invention is preferable. Incidentally, still stronger bleachingor dyeing effect is available from use of ammonia. When ammonia is used,its proportion, from the standpoint of reducing its irritating odor, maypreferably be from 0.01 to 3 wt. %, notably from 0.1 to 1 wt. % based onthe whole composition formed in combination of the first pack and thesecond pack.

The alkalizing agent can be used preferably in such an amount that thefree alkali value in the first pack in which the alkalizing agent isincorporated falls within a range of from 1 to 10, especially from 2 to8. A free alkali value smaller than 1 cannot bring about sufficientbleaching or dyeing effect, while a free alkali value greater than 10leads to stronger irritation to the scalp.

The term “free alkali value” as used herein means a value measured aswill be described next. Described specifically, about 1 g of a sample(first pack) was taken. It was accurately weighed, followed bydissolution in deionized water (50 mL). Using 0.1 N hydrochloric acid,titration was conducted with an end point being set at pH 7, and a freealkali value was calculated in accordance with the following formula:Free alkali value=(Y×0.1/Xwherein X represents the amount (g) of the sample, and Y represents theconsumption (mL) of 0.1 N hydrochloric acid.

Examples of the oxidizing agent as the ingredient (C) can include oxygenperoxide, urea peroxide, melamine peroxide, sodium perborate, potassiumperborate, sodium percarbonate, and potassium percarbonate, withhydrogen peroxide being particularly preferred. From the standpoint ofproviding sufficient bleaching or dyeing effect and also reducingirritation to the scalp, the content of the oxidizing agent may be from0.1 to 12 wt. % based on the whole composition formed in combination ofthe first pack and the second pack, with 2 to 12 wt. % being preferred.

The content of water as the ingredient (D), from the standpoint ofproviding sufficient bleaching or dyeing effect, may range from 25 to 70wt. % based on the whole composition formed in combination of the firstpack and the second pack, with 20 to 60 wt. %, especially 30 to 55 wt. %being preferred.

Further incorporation of an anionic surfactant or an ampholyticsurfactant as an ingredient (E) in the hair bleach or hair dye accordingto the present invention makes it possible to improve the bleaching ordyeing effect and also to improve the storage stability. An anionicsurfactant is particularly preferred for its low irritation to thescalp. Illustrative of the anionic surfactant are alkyl sulfate estersalts such as sodium lauryl sulfate, alkyl ether sulfate ester saltssuch as sodium polyoxyethylene lauryl sulfate, N-acylated glutamatesalts such as monosodium N-lauroyl glutamate, N-acylated sarcocinates,alkyl ether phosphate salts, alkyl ether sulfosuccinate salts, andalkylbenzene sulfonate salts. Among these, alkyl ether sulfate estersalts and N-acylated glutamate salts being preferred. Illustrative ofthe ampholytic surfactant are alkylamide propylbetaine such as lauramidepropylbetaine, alkylimidazolinium betaines such as2-alkyl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine,alkyldimethylaminoacetic acid betaines, and alkylhydroxy-sulfobetaines.Among these, alkylamidopropylbetaines and alkylimidazolinium betainesare preferred. As the ingredient (E), it is also possible to use ananionic surfactant and an ampholytic surfactant in combination or to usetwo or more compounds in combination. From the standpoint of providingsufficient bleaching or dyeing effect and also storage stability, thecontent of the ingredient (E) may be from 0 to 60 wt. % based on thewhole composition formed in combination of the first pack and the secondpack, with 5 to 60 wt. %, especially 10 to 30 wt. % being preferred.

Further incorporation of a quaternized-nitrogen-atom-containing polymeras an ingredient (F) can provide the hair bleach or hair dye accordingto the present invention with improved bleaching or dyeing effect andpost-dyeing hair conditioning effect. Its effects can be heightenedfurther when used in combination with an anionic surfactant. Examples ofthe quaternized-nitrogen-atom-containing polymer can include cationizedcellulose derivatives [as commercial products, “LEOGUARD G” and“LEOGUARD GP” (products of Lion Corporation), “Catinal LC-100”, “PolymerJR-125”, “Polymer JR-400”, “Polymer JR-30M”, “Polymer JR-400” and“Polymer LR-30M” (products of Union Carbide Corp.), and “Celquat H-100”and “Celquat L200” (products of National Starch and Chemical Company);cationized polysaccharides [as commercial products, “Jaguar C-13S”,“Jaguar C-14S”, “Jaguar C-17”, “Jaguar C-162”, “Jaguar C-210” and“Jaguar HI-CARE 1000” (products of Rhone-Poulenc S.A.)]; diallyl dialkylquaternary ammonium salt derivatives [as commercial products, “Merquat100”, “Merquat 280”, “Merquat 295” and “Merquat 550” (products of BFGoodrich Co.)]; cationized polyvinyl-pyrrolidone derivatives [ascommercial products, “Gafquat 734”, “Gafquat 755” and “Gafquat 755N”(products of ISP Japan Ltd.)]. Among these, diallyl dialkyl quaternaryammonium salt derivatives are preferred. These cationic polymers can beused either singly or in combination. From the standpoint of providingsufficient bleaching or dyeing effect and post-dyeing hair conditioningeffect, the content of the quaternary-nitrogen-atom-containing polymermay be preferably from 0 to 2.5 wt. %, more preferably from 0.3 to 2 wt.%, notably from 0.3 to 1 wt. % based on the whole composition formed incombination of the first pack and the second pack.

When the invention product is a hair dye, an oxidative dye intermediateor a direct dye is incorporated. When the invention product is a hairbleach, on the other hand, neither of these are incorporated.

As such an oxidative dye intermediate, known color developing substanceand coupling substance, which are commonly employed in oxidative hairdyes, can be used. Illustrative of the color developing substance arep-phenylenediamines each of which contains one or more of NH₂— groups,NHR— groups and NR₂ groups (R represents an alkyl or hydroxyalkyl grouphaving 1 to 4 carbon atoms), such as p-phenylenediamine,p-toluylenediamine, N-methyl-p-phenylenediamine,N,N-dimethyl-p-phenylenediamine,N,N-diethyl-2-methyl-p-phenylenediamine,N-ethyl-N-(hydroxyethyl)-p-phenylene-diamine, chloro-p-phenylenediamine,2-(2′-hydroxyethyl-amino)-5-aminotoluene,N,N-bis-(2-hydroxyethyl)-p-phenylenediamine, methoxy-p-phenylenediamine,2,6-dichloro-p-phenylenediamine, 2-chloro-6-bromo-p-phenylenediamine,2-chloro-6-methyl-p-phenylenediamine,6-methoxy-3-methyl-p-phenylenediamine, 2,5-diaminoanisole,N-(2-hydroxypropyl)-p-phenylenediamine, andN-2-methoxyethyl-p-phenylenediamine; 2,5-diaminopyridine derivatives;p-aminophenols and o-aminophenols, such as p-aminophenol,2-methyl-4-aminophenol, 3-methyl-4-aminophenol, 2-chloro-4-aminophenol,3-chloro-4-aminophenol, 2,6-dimethyl-4-aminophenol,3,5-dimethyl-4-aminophenol, 2,3-dimethyl-4-aminophenol,2,5-dimethyl-4-aminophenol, 2,4-diaminophenol, and 5-aminosalicylicacid; and o-phenylenediamines.

Illustrative of the coupling substance, on the other hand, areα-naphthol, o-cresol, m-cresol, 2,6-dimethylphenol, 2,5-dimethylphenol,3,4-dimethylphenol, 3,5-dimethyiphenol, benzcatechin, pyrogallol,1,5-dihydroxynaphthalene, 1,7-dihydroxynaphthalene,5-amino-2-methylphenol,5-(2′-hydroxyethylamino)-4-methoxy-2-methylphenol, hydroquinone,2,4-diaminoanisole, m-toluylenediamine, 4-aminophenol, resorcin,resorcin monomethyl ether, m-phenylenediamine,1-phenyl-3-methyl-5-pyrazolone, 1-phenyl-3-amino-5-pyrazolone,1-phenyl-3,5-diketopyrazolone,1-methyl-7-dimethylamino-4-hydroxy-2-quinolone, m-aminophenol,4-chlororesorcin, 2-methylresorcin, 2,4-diaminophenoxyethanol,2,6-diaminopyridine, 3,5-diaminotrifluoromethylbenzene,2,4-diaminofluorobenzene, 3,5-diaminofluorobenzene,2,4-diamino-6-hydroxypyrimidine, 2,4,6-triaminopyrimidine,2-amino-4,6-dihydroxypyrimidine, 4-amino-2,6-dihydroxy-pyrimidine, and4,6-diamino-2-hydroxypyrimidine.

Color developing substances and coupling substances can be used eithersingly or in combination, respectively. Their contents may each be from0.01 to 5 wt. % based on the whole composition formed in combination ofthe first pack and the second pack, with 0.1 to 4 wt. % beingparticularly preferred.

As the direct dye, on the other hand, known acidic dyes, basic dyes,disperse dyes, reactive dyes and the like, which are usable in hairdyes, cam be used. Illustrative of the acidic dyes are Acid Red 27 (C.I.16185), Acid Red 51 (C.I. 45430), Acid Red 18 (C.I. 16255), Acid Red 92(C.I. 45410), Acid Red 94 (C.I. 45440), Acid Red 52 (C.I. 45100), AcidYellow 23 (C.I. 19140), Food Yellow 3 (C.I. 15985), Food Green 3 (C.I.42053), Food Blue 2 (C.I. 42090), Acid Blue 74 (C.I. 73015), Pigment Red57-1 (C.I. 15850), Acid Red 33 (C.I. 17200), Acid Red 87 (C.I. 45380),Acid Red 92 (C.I. 45410), Acid Red 94 (C.I. 45440), Acid Orange 7 (C.I.15510), Acid Red 95 (C.I. 45425), Acid Yellow 73 (C.I. 45350), AcidYellow 3 (C.I. 47005), Acid Green 25 (C.I. 61570), Solvent Green 7 (C.I.59040), Acid Green 5 (C.I. 42095), Acid Blue 5 (C.I. 42052), Acid Blue 9(C.I. 42090), Acid Orange 24 (C.I. 20170), Acid Violet 9 (C.I. 45190),Food Red 6 (C.I. 16155), Acid Red 26 (C.I. 16150), Food Red 1 (C.I.14700), Acid Red 88 (C.I. 15620), Acid Orange 20 (C.I. 14600), AcidYellow 40 (C.I. 18950), Acid Yellow 1 (C.I. 10316), Acid Yellow 36 (C.I.13065), Acid Yellow 11 (C.I. 18820), Acid Green 1 (C.I. 10020), AcidGreen 3 (C.I. 42085), Acid Violet 43 (C.I. 60730), Acid Black 1 (C.I.20470), Acid Black 52 (C.I. 15711), Acid Blue 1 (C.I. 42045), Acid Blue3 (C.I. 42051), Acid Blue 62 (C.I. 62045), Acid Brown 13 (C.I. 10410),Acid Green 50 (C.I. 44090), Acid Orange 3 (C.I. 10385), Acid Orange 6(C.I. 14270), Acid Red 14 (C.I. 14720), Acid Red 35 (C.I. 18065), AcidRed 73 (C.I. 27290), Acid Red 184 (C.I. 15685), and Brilliant Black 1(C.I. 28440).

Illustrative of the basic dyes are Basic Blue 7 (C.I. 42595), Basic Blue26 (C.I. 44045), Basic Blue 99 (C.I. 56059), Basic Violet 10 (C.I.45170), Basic Violet 14 (C.I. 42515), Basic Brown 16 (C.I. 12250), BasicBrown 17 (C.I. 12251), Basic Red 2 (C.I. 50240), Basic Red 22 (C.I.11055), Basic Red 76 (C.I. 12245), Basic Red 118 (C.I. 12251:1), andBasic Yellow 57 (C.I. 12719); basic dyes each having a quaternizednitrogen atom in a side chain of an aromatic ring as disclosed inJP-B-58002204, JP-A-09118832 or the like; and basic dyes each having aquaternized nitrogen atom and —Z¹═Z²— bond (Z¹ and Z² each independentlyrepresents a nitrogen atom or a —CH═ group), which may be nonlocalized,and respectively represented by the following formulas, as disclosed inJapanese Language Laid-open Publication (PCT) No. HEI 10-502946(JP-A-10502946), JP-A-10182379, JP-A-11349457, etc.:

Illustrative of direct dyes other than acidic dyes or basic dyes are2-amino-3-nitrophenol, 2-amino-4-nitrophenol, 2-amino-5-nitrophenol,4-amino-3-nitrophenol, 2-amino-6-chloro-4-nitrophenol,4-hydroxypropylamino-3-nitrophenol, 3-nitro-p-hydroxyethylaminophenol,2-nitro-p-phenylene-diamine, 4-nitro-o-phenylenediamine,4-nitro-m-phenylene-diamine, 6-nitro-o-toludine, 6-nitro-p-toluidine,hydroxyethyl-2-nitro-p-toluidine,N,N′-bis(2-hydroxy-ethyl)-2-nitro-p-phenylenediamine,2-chloro-5-nitro-N-hydroxyethyl-p-phenylenediamine,2-nitro-5-glyceryl-methylaniline, 3-methylamino-4-nitrophenoxyethanol,N-ethyl-3-nitroPABA, picramic acid, 2-hydroxyethylpicramic acid,4-nitrophenylaminoethylurea, Solvent Violet 13 (C.I. 60725), SolventYellow 44 (C.I. 56200), Disperse Red 17 (C.I. 11210), Disperse Violet 1(C.I. 61100), Disperse Violet 4 (C.I. 61105), Disperse Blue 3 (C.I.61505), Disperse Blue 7 (C.I. 62500), HC Blue No. 2, HC Blue No. 8, HCOrange No. 1, HC Orange No. 2, HC Red No. 1, HC Red No. 3, HC Red No. 7,HC Red No. 8, HC Red No. 10, HC Red No. 11, HC Red No. 13, HC Red No.16, HC Violet No. 2, HC Yellow No. 2, HC Yellow No. 5, HC Yellow No. 6,HC Yellow No. 7, HC Yellow No. 9, and HC Yellow No. 12.

These direct dyes can be used either singly or in combination. Thecontent of the direct dye may be from 0.001 to 5 wt. % based on thewhole composition formed in combination of the first pack and the secondpack, with 0.01 to 4 wt. % being particularly preferred.

In the hair bleach or hair dye according to the present invention, afragrance may be incorporated. As the hair bleach or hair dye accordingto the present invention can bring about sufficient bleaching or dyeingeffect even when ammonium is not used as an alkalizing agent, it has amerit in that a high degree of freedom can be enjoyed upon perfumery,thereby making it easier to impart various fragrances such as fruityfragrances and floral fragrances.

To the hair bleach or hair dye according to the present invention,ingredients commonly employed in the field of cosmetics can be added toextents not impairing the effects of the present invention, in additionto the above-described ingredients. Illustrative of such optionalingredients are natural or synthetic, high molecular compounds, fattyacids, oils and fats, hydrocarbons, higher alcohols, monohydric orpolyhydric alcohols, silicone derivatives, nonionic surfactants, amineoxides, amino acid derivatives, protein derivatives, preservatives,metal scavengers, oxidation inhibitors, stabilizers for hydrogenperoxide, plant extracts, vitamins, colorants, pigments, UV absorbers,and pH adjusters.

Like oxidative hair bleaches or hair colors widely employed these days,the hair bleach or hair color according to the present invention can beprovided as a two-pack type hair bleach or hair color comprising a firstpack with an alkalizing agent contained therein and a second pack withan oxidizing pack contained therein. These first and second packs aremixed preferably at a ratio of from 2:1 to 1:3 (weight ratio) upon use.These first pack and second pack can be prepared by methods known per sein the art. No particular limitation is imposed on their preparationforms. For example, they can be formed into solutions, emulsions,creams, gels, pastes, mousses, or the like. As a still furtheralternative, they can be prepared into aerosol forms.

The pH of the hair bleach or hair dye according to the present inventionat the stage of its use (in other words, after the first pack and thesecond pack are mixed together) may be from 8 to 12, with 8.5 to 11being preferred. A pH lower than 8 cannot bring about the effects of thepresent invention to full extents, while a pH higher than 12 leads tostrong irritation to the scalp. pHs outside this range are, therefore,improper from the practical viewpoint.

To bleach or dye hair with the hair bleach or hair dye according to thepresent invention, it is only necessary, for example, to apply the hairbleach or hair dye according to the present invention to the hair at atemperature of from 15 to 45° C. and after an acting time of from 1 to50 minutes, preferably from 3 to 30 minutes, to wash the hair and thento dry the same.

EXAMPLES Example 1

Oxidative hair bleaches shown in Tables 1 and 2 were formulated, andtheir bleaching performances were ranked.

(Formulation Method)

The hair bleach as Invention Product 1 was formulated as will bedescribed hereinafter (the first pack and the second pack were used bymixing them in the same weights, respectively). In addition, the hairbleaches as Invention Products 2–4 and Comparative Products 1–9 werealso formulated following the formulation method of Invention Product 1.

First Pack

To 2-benzyloxyethanol (24 g), polyoxyethylene (3) tridecyl ether (20 g),a 68 wt. % aqueous solution (15 g) of sodium polyoxyethylene (2) laurylether sulfate and a 30 wt. % aqueous solution (26.7 g) oflauramidopropylbetaine were added, followed by stirring into ahomogeneous mixture. Water (10.3 g) and monoethanolamine (4 g) wereadded further, and the resulting mixture was stirred to give ahomogeneous mixture.

Second Pack

To water (31.9 g), a 68 wt. % aqueous solution (35 g) of sodiumpolyoxyethylene (2) lauryl ether sulfate, polyoxyethylene (3) tridecylether (16 g) and a 35 wt. % aqueous solution (17.1 g) of hydrogenperoxide were added, followed by stirring into a homogeneous mixture.

(Ranking Method)

Using hair collected from a Japanese and having no history of chemicaltreatment, eight tresses, each of 10 g, were provided. Then, they wereeach evenly coated with corresponding one sample (7 g) selected from ofInvention Products 1–2 and Comparative Products 1–5. After the tresseswere allowed to stand for 15 minutes in a constant temperature chambercontrolled at 30° C., they were rinsed with tepid water of 30° C.,shampooed and rinsed, and then dried. The thus-treated tresses werecompared with the remaining one tress, and the degrees of theirbleaching were ranked by a panel of 10 experts on the basis of thebelow-described standard. The results are presented in terms of totalscores in Tables 1 and 2.

(Ranking Standard)

4: Bleached into a significantly light color.

3: Bleached into a light color.

2: Bleached into a slightly light color.

1: Color shade did not change substantially.

0: Color shade did not change at all.

TABLE 1 Invention product Comparative product 1 2 1 2 3 4 5 Compositionof the first pack + the second pack (parts by weight) Sodiumpolyoxyethylene (2) 17 17 17 17 17 17 17 lauryl ether sulfateLauramidopropylbetaine 4 4 4 4 4 4 4 Polyoxyethylene (3) tridecyl 18 1818 18 18 18 18 ether Monoethanolamine 2 2 2 2 2 2 5 Ammonia — 0.56 — — —0.56 0.56 Hydrogen peroxide 3 3 3 3 3 3 3 Benzyloxyethanol (log P = 1.2)12 12 4 — — — — Ethanol (log P = −0.3) — — — 12 — 12 12 Propylene glycol(log P = −1.1) — — — — 12 — — Water 44 43.44 52 44 44 43.44 40.44Ranking of bleaching power 31 38 20 11 10 13 19 (40 points max.)

TABLE 2 Invention product Comparative product 3 4 6 7 8 9 Composition ofthe first pack + the second pack (parts by weight) Sodiumpolyoxyethylene (2) lauryl 15 15 3 3 15 15 ether sulfateLauramidopropylbetaine 4 4 4 4 4 4 Polyoxyethylene (3) tridecyl ether 1515 15 15 2 2 Benzyl alcohol (log P = 1.1) 12 12 12 12 2 2Monoethanolamine 2 2 2 2 2 2 Ammonia — 0.56 — 0.56 — 0.56 Hydrogenperoxide 3 3 3 3 3 3 Water 44 48.44 61 60.44 72 71.44 Ranking ofbleaching power (40 30 37 17 20 11 14 points max.)

As is evident from Tables 1 and 2, the invention products had excellentbleaching performance. In particular, Invention Products 1 and 3 did notgive unpleasant feeling upon bleaching as they were free of ammonia.

Example 2 Bleach composition (the first pack and the second pack wereused by mixing them in the same weights) (wt. %) First pack Sodiumpolyoxyethylene (2) lauryl ether sulfate 15 Coconut fatty aciddiethanolamide 40 Benzyl alcohol 25 28 wt. % Aqueous ammonia 7 Water 13Second pack Sodium polyoxyethylene (2) lauryl ether sulfate 20 Coconutfatty acid diethanolamide 2 35 wt. % Hydrogen peroxide solution 17 75wt. % Phosphoric acid solution 0.3 Water 60.7 Example 3 Bleachcomposition (the first pack and the second pack were used by mixing themin the same weights) (wt. %) First pack Polyoxyethylene (9) nonyl phenylether 15 Sodium lauroyl glutamate 5 Oleic acid 5 Polyoxyethylene (9)tridecyl ether 30 Benzyl alcohol 25 28 wt. % Aqueous ammonia 7 Water 13Second pack Sodium polyoxyethylene (2) lauryl ether sulfate 20Polyoxyethylene (2) tridecyl ether 2 35 wt. % Hydrogen peroxide solution17 75 wt. % Phosphoric acid solution 0.3 Water 60.7 Example 4 Hair dyecomposition (the first pack and the second pack were used by mixing themin the same weights) (wt. %) First pack Sodium polyoxyethylene (2)lauryl ether sulfate 20 Oleic acid 5 2-Benzyloxyethanol 20Monoethanolamine 5 Anhydrous sodium sulfite 0.41-(2-Hydroxyethyl)-2,5-diaminobenzene 1.34 dihydrochloride2,4-Diaminophenoxyethanol 1 Water 47.26 Second pack Sodiumpolyoxyethylene (2) lauryl ether sulfate 20 Oleyl alcohol 20Polyoxyethylene (25) octyl dodecyl ether 25 2-Benzyloxyethanol 15 35 wt.% Hydrogen peroxide solution 17 75 wt. % Phosphoric acid solution 0.3Water 2.7 Example 5 Hair dye composition (the first pack and the secondpack were used by mixing them in the same weights) (wt. %) First packSodium polyoxyethylene (2) lauryl ether sulfate 12 Polyoxyethylene (3)tridecyl ether 39 Ethylene glycol mono-n-butyl ether 20 Monoethanolamine5 Anhydrous sodium sulfite 0.4 o-Aminophenol 1.5 Water 22.1 Second packSodium polyoxyethylene (2) lauryl ether sulfate 22 Polyoxyethylene (3)tridecyl ether 2 35 wt. % Hydrogen peroxide solution 17 75 wt. %Phosphoric acid solution 0.3 Water 58.7 Example 6 Hair dye composition(the first pack and the second pack were used by mixing them in the sameweights) (wt. %) First pack Sodium lauroyl glutamate 5 Sodium lauroylsulfate 5 Sodium alkane sulfonate 3 Polyoxyethylene (3) tridecyl ether39 2-Benzyloxyethanol 25 Monoethanolamine 4 28 wt. % Aqueous ammonia 3.5Anhydrous sodium sulfite 0.4 Toluene-2, 5-diamine 1 m-Aminophenol 1“Merquat 550” (product of BF Goodrich Co.) 4.5 Water 8.6 Second packSodium polyoxyethylene (2) lauryl ether sulfate 15 Polyoxyethylene (9)lauryl ether 5 35 wt. % Hydrogen peroxide solution 17 75 wt. %Phosphoric acid solution 0.3 Water 62.7 Example 7 Hair dye composition(the first pack and the second pack were used by mixing them in the sameweights) (wt. %) First pack Sodium polyoxyethylene (2) lauryl ethersulfate 12 Polyoxyethylene (3) tridecyl ether 39 Benzyl alcohol 20Monoethanolamine 5 “Merquat 280” (product of BF Goodrich Co.) 1.3“Merquat 295” (product of BF Goodrich Co.) 0.6 Anhydrous sodium sulfite0.4 N,N-Bis(2-hydroxyethyl)-p-phenylenediamine 2.15 sulfate Resorcin 0.8Water 18.75 Second pack Sodium polyoxyethylene (2) lauryl ether sulfate22 Polyoxyethylene (3) tridecyl ether 2 35 wt. % Hydrogen peroxidesolution 17 75 wt. % Phosphoric acid solution 0.3 Water 58.7 Example 8Hair dye composition (the first pack and the second pack were used bymixing them in the same weights) (wt. %) First pack Sodiumpolyoxyethylene (2) lauryl ether sulfate 12 Polyoxyethylene (3) tridecylether 39 2-Benzyloxyethanol 24 Monoethanolamine 4 28 wt. % Aqueousammonia 1 Acid Red 52 0.6 Water 19.4 Second pack Sodium polyoxyethylene(2) lauryl ether sulfate 22 Polyoxyethylene (3) tridecyl ether 2 35 wt.% Hydrogen peroxide solution 17 75 wt. % Phosphoric acid solution 0.3Water 58.7 Example 9 Hair dye composition (the first pack and the secondpack were used by mixing them in the same weights) (wt. %) First packSodium polyoxyethylene (2) lauryl ether sulfate 2 Polyoxyethylene (9)nonyl phenyl ether 15 Polyoxyethylene (9) tridecyl ether 30 Benzylalcohol 25 Monoethanolamine 3.5 28 wt. % Aqueous ammonia 1 Basic Red 760.5 Water 23 Second pack Polyoxyethylene (9) tridecyl ether 22 35 wt. %Hydrogen peroxide solution 17 75 wt. % Phosphoric acid solution 0.3Water 60.7 Example 10 Hair dye composition (the first pack and thesecond pack were used by mixing them in the same weights) (wt. %) Firstpack Sodium polyoxyethylene (2) lauryl ether sulfate 7 Sodiumα-olefinsulfonate 6 Coconut fatty acid diethanolamide 20 Polyoxyethylene(3) tridecyl ether 21 2-Benzyloxyethanol 22 28 wt. % Aqueous ammonia 1Isopropanolamine 4 Anhydrous sodium sulfite 0.4 “Catinal LC-100”(product of Union Carbide 0.3 Corp.) o-Aminophenol 1.5 Disperse Blue 70.2 Water 16.6 Second pack Sodium polyoxyethylene (2) lauryl ethersulfate 20 Polyoxyethylene (20) lauryl ether 2 35 wt. % Hydrogenperoxide solution 17 75 wt. % Phosphoric acid solution 0.3 Water 60.7Example 11 Hair dye composition (the first pack and the second pack wereused by mixing them in the same weights) (wt. %) First pack Sodiumalkane sulfonate 7 Lauramidopropylbetaine 5 Polyoxyethylene (9) laurylether 25 “Polyether-modified Silicone KF-6005” 0.5 (product of Shin-EtsuChemical Co., Ltd.) Ethylene glycol mono-n-butyl ether 20 “CatinalLC-100” (product of Union Carbide 0.4 Corp.) 28 wt. % Aqueous ammonia 1Isopropanolamine 4 Anhydrous sodium sulfite 0.4p-Nitro-o-phenylenediamine 0.3 p-Aminophenol 0.9 p-Amino-o-cresol 1Water 34.5 Second pack Sodium polyoxyethylene (2) lauryl ether sulfate12 Sodium lauroyl glutamate 5 Diethylene glycol mono-n-butyl ether 5“Polyether-modified Silicone KF-6005” 0.5 (product of Shin-Etsu ChemicalCo., Ltd.) 35 wt. % Hydrogen peroxide solution 17 75 wt. % Phosphoricacid solution 0.3 Water 60.2 Example 12 Hair dye composition (the firstpack and the second pack were used by mixing them in the same weights)(wt. %) First pack Sodium polyoxyethylene (2) lauryl ether sulfate 2Polyoxyethylene (9) nonyl phenyl ether 15 Polyoxyethylene (9) tridecylether 30 Benzyl alcohol 25 Monoethanolamine 5 Anhydrous sodium sulfite0.4 p-Aminophenol 0.9 p-Amino-o-cresol 1 Basic Red 22 0.2 Water 20.5Second pack Polyoxyethylene (9) tridecyl ether 22 35 wt. % Hydrogenperoxide solution 17 75 wt. % Phosphoric acid solution 0.3 Water 60.7Example 13 Bleach composition (the first pack and the second pack wereused by mixing them in the same weights) (wt. %) First packPolyoxyethylene (9) nonyl phenyl ether 15 Sodium lauroyl glutamate 5Oleyl alcohol 3 Polyoxyethylene (9) tridecyl ether 30 2-Benzyloxyethanol18 28 wt. % Aqueous ammonia 7 Water 22 Second pack Sodiumpolyoxyethylene (2) lauryl ether sulfate 20 Polyoxyethylene (2) tridecylether 2 35 wt. % Hydrogen peroxide solution 17 75 wt. % Phosphoric acidsolution 0.3 Water 60.7 Example 14 Bleach composition (the first packand the second pack were used by mixing them in the same weights) (wt.%) First pack Sodium polyoxyethylene (2) lauryl ether sulfate 15 Coconutfatty acid diethanolamide 40 2-Benzyloxyethanol 14 28 wt. % Aqueousammonia 7 Water 24 Second pack Sodium polyoxyethylene (2) lauryl ethersulfate 20 Coconut fatty acid diethanolamide 2 35 wt. % Hydrogenperoxide solution 17 75 wt. % Phosphoric acid solution 0.3 Water 60.7Example 15 Hair dye composition (the first pack and the second pack wereused by mixing them in the same weights) (wt. %) First pack Sodiumpolyoxyethylene (2) lauryl ether sulfate 20 Oleyl alcohol 32-Benzyloxyethanol 20 Monoethanolamine 5 Anhydrous sodium sulfite 0.4p-Aminophenol 0.9 p-Amino-o-cresol 1 Water 49.7 Second pack Sodiumpolyoxyethylene (2) lauryl ether sulfate 20 Oleyl alcohol 20Polyoxyethylene (25) octyl dodecyl ether 25 2-Benzyloxyethanol 15 35 wt.% Hydrogen peroxide solution 17 75 wt. % Phosphoric acid solution 0.3Water 2.7 Example 16 Hair dye composition (the first pack and the secondpack were used by mixing them in the same weights) (wt. %) First packSodium polyoxyethylene (2) lauryl ether sulfate 12 Polyoxyethylene (3)tridecyl ether 39 Ethylene glycol mono-n-butyl ether 20 Monoethanolamine5 Anhydrous sodium sulfite 0.4 o-Aminophenol 1.5 Water 22.1 Second packSodium polyoxyethylene (2) lauryl ether sulfate 22 Polyoxyethylene (3)tridecyl ether 2 35 wt. % Hydrogen peroxide solution 17 75 wt. %Phosphoric acid solution 0.3 Water 58.7 Example 17 Hair dye composition(the first pack and the second pack were used by mixing them in the sameweights) (wt. %) First pack Sodium polyoxyethylene (2) lauryl ethersulfate 12 Polyoxyethylene (3) tridecyl ether 39 Benzyl alcohol 20Monoethanolamine 5 “Merquat 280” (product of BF Goodrich Co.) 1.3“Merquat 295” (product of BF Goodrich Co.) 0.6 Anhydrous sodium sulfite0.4 N,N-Bis(2-hydroxyethyl)-p-phenylenediamine 3.24 sulfatem-Aminophenol 1.2 Water 17.26 Second pack Sodium polyoxyethylene (2)lauryl ether sulfate 22 Polyoxyethylene (3) tridecyl ether 2 35 wt. %Hydrogen peroxide solution 17 75 wt. % Phosphoric acid solution 0.3Water 58.7 Example 18 Hair dye composition (the first pack and thesecond pack were used by mixing them in the same weights) (wt. %) Firstpack Sodium lauroyl glutamate 5 Sodium lauroyl sulfate 5 Sodium alkanesulfonate 3 Polyoxyethylene (3) tridecyl ether 39 2-Benzyloxyethanol 25Monoethanolamine 4 28 wt. % Aqueous ammonia 3.5 Anhydrous sodium sulfite0.4 Toluene-2,5-diamine 1.8 2-Methylresorcin 1.8 “Merquat 550” (productof BF Goodrich Co.) 4.5 Water 7 Second pack Sodium polyoxyethylene (2)lauryl ether sulfate 15 Polyoxyethylene (9) lauryl ether 5 35 wt. %Hydrogen peroxide solution 17 75 wt. % Phosphoric acid solution 0.3Water 62.7 Example 19 Hair dye composition (the first pack and thesecond pack were used by mixing them in the same weights) (wt. %) Firstpack Sodium alkane sulfonate 7 Lauramidopropylbetaine 5 Polyoxyethylene(9) lauryl ether 25 “Polyether-modified Silicone KF-6005” 0.5 (productof Shin-Etsu Chemical Co., Ltd.) Ethylene glycol mono-n-butyl ether 20“Catinal LC-100” (product of Union Carbide 0.4 Corp.) 28 wt. % Aqueousammonia 1 Isopropanolamine 4 Anhydrous sodium sulfite 0.4 Acid Yellow 30.3 p-Aminophenol 0.9 p-Amino-o-cresol 1 Water 34.5 Second pack Sodiumpolyoxyethylene (2) lauryl ether sulfate 12 Sodium lauroyl glutamate 5Diethylene glycol mono-n-butyl ether 5 “Polyether-modified SiliconeKF-6005” 0.5 (product of Shin-Etsu Chemical Co., Ltd.) 35 wt. % Hydrogenperoxide solution 17 75 wt. % Phosphoric acid solution 0.3 Water 60.2Example 20 Hair dye composition (the first pack and the second pack wereused by mixing them in the same weights) (wt. %) First pack Sodiumpolyoxyethylene (2) lauryl ether sulfate 7 Sodium α-olefinsulfonate 6Coconut fatty acid diethanolamide 20 Polyoxyethylene (3) tridecyl ether21 2-Benzyloxyethanol 10 28 wt. % Aqueous ammonia 1 Isopropanolamine 4Anhydrous sodium sulfite 0.4 “Catinal LC-100” (product of Union Carbide0.3 Corp.) o-Aminophenol 1.5 Disperse Blue 3 0.2 Water 28.6 Second packSodium polyoxyethylene (2) lauryl ether sulfate 20 Polyoxyethylene (20)lauryl ether 2 35 wt. % Hydrogen peroxide solution 17 75 wt. %Phosphoric acid solution 0.3 Water 60.7 Example 21 Hair dye composition(the first pack and the second pack were used by mixing them in the sameweights) (wt. %) First pack Sodium polyoxyethylene (2) lauryl ethersulfate 12 Polyoxyethylene (3) tridecyl ether 39 Benzyloxyethanol 24Monoethanolamine 4 28 wt. % Aqueous ammonia 1 Acid Orange 7 0.5 Water19.5 Second pack Sodium polyoxyethylene (2) lauryl ether sulfate 22Polyoxyethylene (3) tridecyl ether 2 35 wt. % Hydrogen peroxide solution17 75 wt. % Phosphoric acid solution 0.3 Water 58.7

The bleaches and hair dyes of Examples 2–21 had excellent bleaching ordyeing power and further, were free of an irritating odor or irritationto the scalp upon application.

1. An oxidative hair bleach comprising a first pack with an alkalizingagent contained therein and a second pack with an oxidizing agentcontained therein, wherein said oxidative hair bleach comprises thefollowing ingredients (A), (B), (C), (D), and (E) in the followingproportions in a whole composition after mixing said first pack and saidsecond pack together, and has a pH of from 8 to 12: (A) benzyl alcoholor benzyloxyethanol: 8 to 40 wt. % (B) said alkalizing agent: 0.1 to 10wt. % (C) said oxidizing agent: 0.1 to 12 wt. % as calculated in termsof hydrogen peroxide (D) water: 20 to 60 wt. % and (E) an anionicsurfactant or ampholytic surfactant in a proportion of from 5 to 60 wt.% in said whole composition after mixing said first pack and said secondpack together.
 2. A bleach according to claim 1, further comprising, asan ingredient (F), a quaternized-nitrogen-atom-containing polymer in aproportion of 2.5 wt. % or less in said whole composition after mixingsaid first pack and said second pack together.
 3. A method for bleachinghair, which comprises applying to said hair a bleach according toclaim
 1. 4. A method for bleaching hair, which comprises applying tosaid hair the bleach according to claim
 2. 5. A bleach according toclaim 1, further comprising as an ingredient (F), aquarternized-nitrogen-atom-containing polymer in a proportion of from0.3 to 2.5 wt % in said whole composition after mixing said first packand said second pack together.
 6. A bleach according to claim 1, wherein(A) ranges from 10 to 40 wt. %.
 7. A bleach according to claim 1,wherein (A) ranges from 10 to 25 wt. %.
 8. A bleach according to claim1, wherein (B) ranges from 0.5 to 5 wt. %.
 9. A bleach according toclaim 1, wherein (B) ranges from 1 to 3 wt. %.
 10. A bleach according toclaim 1, wherein (C) ranges from 2 to 12 wt. %.
 11. A bleach accordingto claim 1, wherein (D) ranges from 30 to 55 wt. %.
 12. A bleachaccording to claim 1, wherein (E) ranges from 10 to 30 wt. %.
 13. Ableach according to claim 2, wherein (F) ranges from 0.3 to 2 wt. %. 14.A bleach according to claim 2, wherein (F) ranges from 0.3 to 1 wt. %.15. A bleach according to claim 1, wherein the pH ranges from 8.5 to 11.16. A method for bleaching hair, which comprises applying to said hairthe bleach according to claim
 6. 17. A method for bleaching hair, whichcomprises applying to said hair the bleach according to claim
 7. 18. Amethod for bleaching hair, which comprises applying to said hair thebleach according to claim 11.